Check whether React application is running in a Docker container

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For Node servers I am able to figure out whether they are running in a Docker container using the is-docker package. This obviously doesn't work for React applications which run in the browser rather than the command line which makes fs unavailable. Is there any other way to let a web application figure out whether it is running in a Docker container?

docker reactjs node.js
1 Answers

I noticed that create-react-app supports injecting environment variables into process.env during build time using .env files. Thus I created a .env.development file which contains REACT_APP_DOCKERENV=false and a .env.production file which contains REACT_APP_DOCKERENV=true. Those variables are then injected when running yarn start and yarn build respectively.

Of course this assumes my development builds are always executed locally while the production builds are always executed in Docker which works in my particular scenario.

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